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Cystoscopy. Guide. Cystoscopy (say sis-TAW-skuh-pee) is a test that allows your doctor to look at the inside of your bladder and urethra. It's done using a thin, lighted tube called a cystoscope. The doctor inserts this tube into your urethra and on into the bladder.ystoscopy may be done to: 1  Find the cause of many urinary system problems. 2  Remove tissue samples for testing (biopsy). 3  Remove a foreign object. 4  Insert a stent. 5  Treat certain problems. 6  Inject a dye that is used for a special type of X-ray of the ureter and kidney.
Getting Properly Diagnosed. Mega Cisterna Magna and Arachnoid cysts look similar on MRI read outs so in order to correctly diagnosis a ventriculogram should be performed with the injection of dye into the blood or with a catheter into the heart.ith Mega cisterna magna the area has become enlarged but communication between the cerebellar vermis and fourth ventricle is intact. There may be no symptoms with mega cisterna magna and there will be no mass effect. This can be treated with cisternotomy.